Samantha Highfill
January 14, 2016 AT 10:43 PM EST

The Argents are taking over Teen Wolf … and you won’t hear us complaining. 

In addition to Crystal Reed’s return to the show as Marie-Jeanne Valet, the original Argent ancestor, EW has confirmed that Gilles Marini will play Sebastien in the same flashback episode. 

Thanks to the Argent family’s history with The Beast, the show will take fans back in time to 18th Century France in episode 518, which is where we will meet Sebastien. According to TVLine, Sebastien is a French soldier who has a very personal experience with The Beast.

Also joining the fun is The Young and the Restless star Lachlan Buchanan, who will play Henri, an Argent family recluse with a wealth of knowledge about the supernatural.

TVLine first reported the casting news.

Teen Wolf airs Tuesdays at 9 p.m. ET on MTV.

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